Calculators
Customer Retention Rate Calculator – Free & Instant
Retention Rate Calculator — 100% free, unlimited, no sign-up cost.
Customer retention rate is (customers at the end minus new customers) divided by customers at the start, times 100; keeping 90 of 100 starting customers is a 90% retention rate.
Calculate customer retention rate, excluding new customers added during the period. It runs instantly inside GrowthGadgetAi's Marketing Toolkit — completely free, with unlimited uses, no credit cost and no credit card required.
Use the Retention Rate Calculator online at no cost.Common tasks this tool helps with
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Try Retention Rate Calculator free
The Retention Rate formula
Retention Rate = (Customers at End − New Customers) ÷ Customers at Start × 100
Retention rate excludes new customers added during the period, isolating how many of your starting customers actually stuck around.
Example
1,000 customers at the start, 960 at the end, 80 of those were new.
((960 − 80) ÷ 1,000) × 100 = 88% retention rate
Why it's free
This is pure math — the formulas below are public, verifiable and computed instantly in your browser. There was never a real cost to charge for here, so it runs free with zero credits. With the Retention Rate Calculator, you get this without paying per generation or hitting a credit wall.
What you get
- Retention rate as a percentage: (customers at period end − new customers added) ÷ customers at period start × 100
Who uses the Retention Rate Calculator
- SaaS and subscription teams measuring customers kept over a period
- Product marketers tracking onboarding changes
- Founders checking churn before raising ad spend
How it works
- Enter customers at the start of the period
- Enter customers at the end and the new customers added
- Read the retention rate and compare it across periods
Frequently asked questions
Is the Retention Rate Calculator free?
Yes. Every one of GrowthGadgetAi's Marketing Toolkit tools, including the Retention Rate Calculator, is completely free with unlimited use — no credits, no plan requirement and no credit card.
Do I need to create an account to use it?
The Retention Rate Calculator runs without signing up — a free GrowthGadgetAi account only matters if you want your history saved, and it never requires a card.
How is the Retention Rate Calculator's result calculated?
It's a direct formula, not an AI guess — the Retention Rate Calculator computes your % retention rate from the numbers you enter, instantly and the same way every time.
How do I use the Retention Rate Calculator?
1) Enter your Customers at period start and Customers at period end and New customers added during period. 2) See your % retention rate instantly, no submit button needed. 3) Use the number in your reporting or planning. The whole process takes about a minute and runs on this page, on desktop or mobile.
What is the formula behind the Retention Rate Calculator?
Retention Rate = (Customers at End − New Customers) ÷ Customers at Start × 100. Retention rate excludes new customers added during the period, isolating how many of your starting customers actually stuck around.
How do you calculate customer retention rate?
Subtract the new customers gained from the customers at the end, divide by the customers at the start and multiply by 100.
What is the difference between retention and churn?
Churn is the share of customers lost; retention is the share kept. They add up to 100% for the same period.
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